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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Standardized Pollen Allergenic Extract [EPC]
Sheep Wool allergenic extract is a biological product used for the diagnosis and treatment of Type I hypersensitivity to sheep-derived proteins. It belongs to the class of non-standardized animal hair and skin allergenic extracts.
Name
Sheep Wool
Raw Name
SHEEP WOOL
Category
Standardized Pollen Allergenic Extract [EPC]
Drug Count
4
Variant Count
4
Last Verified
February 17, 2026
About Sheep Wool
Sheep Wool allergenic extract is a biological product used for the diagnosis and treatment of Type I hypersensitivity to sheep-derived proteins. It belongs to the class of non-standardized animal hair and skin allergenic extracts.
Detailed information about Sheep Wool
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Sheep Wool.
According to the FDA Center for Biologics Evaluation and Research (CBER), these extracts are intended for use by healthcare professionals to identify specific IgE-mediated allergies through skin testing and to desensitize patients through subcutaneous immunotherapy (SCIT). The use of Sheep Wool as a therapeutic agent dates back several decades, following the foundational principles of allergen immunotherapy established in the early 20th century. It is important to note that Sheep Wool extracts are not 'wool' in the textile sense but are refined biological preparations designed to isolate the allergenic proteins (antigens) found within the wool and the associated dander (epithelial cells).
The mechanism of action for Sheep Wool allergenic extract is twofold, depending on whether it is used for diagnostic or therapeutic purposes.
When used for skin prick testing or intradermal testing, the extract introduces sheep-derived proteins directly into the skin. In individuals who are sensitized, these proteins cross-link specific Immunoglobulin E (IgE) antibodies that are bound to the surface of mast cells and basophils. This cross-linking triggers degranulation, a process where the cells release inflammatory mediators such as histamine, leukotrienes, and prostaglandins. This results in a localized 'wheal and flare' reaction (a raised bump surrounded by redness), which allows the clinician to confirm the presence of a Type I hypersensitivity.
When used for immunotherapy (allergy shots), the mechanism is significantly more complex and involves a fundamental shift in the patient's immune system. Repeated, escalating doses of Sheep Wool extract induce a state of 'immune tolerance.' At the molecular level, this is characterized by:
As a biological allergenic extract administered either epicutaneously (skin prick) or subcutaneously (injection), the pharmacokinetic profile of Sheep Wool differs significantly from traditional small-molecule drugs.
Sheep Wool allergenic extract is FDA-approved for the following indications:
Off-label uses are rare but may include research into cross-reactivity between different mammalian danders (e.g., goat or cattle).
Sheep Wool allergenic extract is available in the following formats:
> Important: Only your healthcare provider can determine if Sheep Wool is right for your specific condition. The selection of the appropriate extract and concentration requires specialized training in allergy and immunology.
The dosage for Sheep Wool allergenic extract is highly individualized and is never a 'one-size-fits-all' regimen. Dosing is divided into two distinct phases: the Build-up Phase and the Maintenance Phase.
During this phase, the patient receives injections once or twice weekly. The starting dose is typically a very low concentration (e.g., 0.05 mL of a 1:10,000 or 1:1,000 w/v dilution). The dose is gradually increased by 0.05 mL to 0.10 mL at each visit, provided the patient does not experience a significant local or systemic reaction. This phase usually lasts 3 to 6 months.
Once the 'effective dose' or 'top dose' is reached (often 0.5 mL of the most concentrated vial, such as 1:20 or 1:10 w/v), the frequency of injections is decreased. Patients typically receive the maintenance dose every 2 to 4 weeks. This phase is generally continued for 3 to 5 years to ensure long-term desensitization.
Sheep Wool allergenic extract is generally considered safe for use in children, typically those aged 5 years and older. The dosing schedule for children is similar to that of adults but requires even more cautious escalation.
No specific dose adjustments are required for patients with renal impairment, as the proteins are not primarily cleared by the kidneys. However, the patient's overall health status must be considered.
No dose adjustments are necessary for patients with liver disease, as the metabolism of allergenic proteins does not involve hepatic enzyme pathways.
Older adults may be at higher risk for complications if a systemic reaction occurs (e.g., due to underlying cardiovascular disease). Healthcare providers may choose a more conservative build-up schedule and monitor these patients more closely.
Sheep Wool allergenic extract is ONLY administered by a healthcare professional in a clinical setting equipped to handle anaphylaxis. It is never self-administered at home.
If a dose is missed during the build-up phase, the next dose may need to be reduced or the previous dose repeated, depending on how much time has passed.
An overdose of Sheep Wool extract refers to the administration of an amount that exceeds the patient's current tolerance level. This can lead to a severe systemic reaction or anaphylaxis.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose or skip visits without medical guidance.
Most patients receiving Sheep Wool allergenic extract will experience some form of local reaction at the site of the injection. These are generally considered a normal part of the body's response to the allergen.
> Warning: Stop receiving Sheep Wool injections and call your doctor or emergency services immediately if you experience any of the following symptoms of anaphylaxis:
There is no evidence that long-term use of Sheep Wool allergenic extract (3-5 years) causes organ damage, cancer, or autoimmune disease. The primary long-term effect is the desired reduction in allergic sensitivity. However, some patients may develop 'subcutaneous nodules' (small, hard lumps under the skin) at the injection sites if the same area is used repeatedly over many years.
According to the FDA-approved labeling for allergenic extracts, a Boxed Warning is present for all such products regarding the risk of severe systemic reactions.
Summary of Warning: Sheep Wool allergenic extract can cause severe life-threatening systemic reactions, including anaphylaxis. Patients with unstable or severe asthma are at a higher risk for fatal reactions. This product must only be administered in a setting where emergency resuscitative equipment and personnel trained in treating anaphylaxis are immediately available. Patients should be observed for at least 30 minutes following administration. Some patients may not respond to standard doses of epinephrine if they are taking beta-blockers.
Report any unusual symptoms to your healthcare provider. Even a mild reaction today could predict a more severe reaction at the next appointment.
Sheep Wool allergenic extract is a potent biological agent that must be handled with extreme caution. It is intended for use only by physicians who are experienced in the administration of allergenic extracts and the treatment of allergic diseases. Patients must be informed of the risks and benefits of immunotherapy before starting treatment.
No FDA black box warnings for Sheep Wool. (Note: While many allergenic extracts carry a general boxed warning regarding anaphylaxis, specific 'Sheep Wool' branded products may vary by manufacturer. Always refer to the specific package insert for the brand being used.)
The most significant risk associated with Sheep Wool extract is a systemic allergic reaction. This is more likely to occur if the patient is highly sensitive, if the dose is increased too rapidly, or if the patient is currently experiencing a high level of environmental allergen exposure (e.g., during peak pollen season if they have multiple allergies).
Patients with asthma must have their condition well-controlled before receiving an injection. If a patient is experiencing an asthma flare-up or has a reduced Peak Expiratory Flow (PEF) on the day of the injection, the dose should be withheld. Uncontrolled asthma is the single greatest risk factor for a fatal reaction to immunotherapy.
Injections should be postponed if the patient has an acute infection, fever, or respiratory illness, as these conditions can lower the threshold for a systemic reaction.
Most patients can drive themselves to and from their appointments. However, if a patient experiences significant fatigue or lightheadedness after an injection, they should avoid operating heavy machinery until the symptoms resolve. If a systemic reaction occurs and epinephrine is administered, the patient should not drive.
There is no direct chemical interaction between Sheep Wool extract and alcohol. However, alcohol consumption can cause vasodilation (widening of blood vessels), which may theoretically increase the rate of allergen absorption and the severity of a systemic reaction. It is generally advised to avoid heavy alcohol use on the day of the injection.
Immunotherapy can be stopped at any time without 'withdrawal' symptoms. However, stopping prematurely (before 3 years) often results in the return of allergy symptoms. If treatment is paused for more than a few weeks, the dose must be tapered (reduced) when restarting to ensure safety.
> Important: Discuss all your medical conditions with your healthcare provider before starting Sheep Wool.
There are no drugs that are strictly 'contraindicated' in the sense of a chemical incompatibility, but certain medications make the management of a reaction nearly impossible.
There are no specific food interactions with Sheep Wool extract. However, patients with 'Oral Allergy Syndrome' or known food allergies should avoid eating highly allergenic foods immediately before or after their injection, as this can 'prime' the immune system and increase the risk of a reaction.
Sheep Wool extract will directly affect the results of Allergy Skin Tests and Serum IgE (ImmunoCAP) tests.
For each major interaction, the primary concern is the management of anaphylaxis. The mechanism is pharmacodynamic (interfering with the action of emergency medications) rather than pharmacokinetic.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking.
Sheep Wool allergenic extract must NEVER be used in the following circumstances:
Conditions requiring a careful risk-benefit analysis include:
Patients allergic to Sheep Wool may also react to:
> Important: Your healthcare provider will evaluate your complete medical history before prescribing Sheep Wool.
Pregnancy Category: C (According to older FDA classification system).
It is not known whether Sheep Wool allergenic proteins are excreted in human milk. However, because these are large proteins that are degraded in the maternal gastrointestinal tract if ingested, it is highly unlikely they would reach the infant in an active form via breast milk. Immunotherapy is generally considered safe for breastfeeding mothers.
Patients over age 65 may receive Sheep Wool extract, but caution is advised.
No dose adjustment is required. The proteins are metabolized by proteases throughout the body and are not dependent on renal excretion for clearance.
No dose adjustment is required. The liver's metabolic enzymes (CYP450) are not involved in the processing of allergenic proteins.
> Important: Special populations require individualized medical assessment to ensure the benefits of allergy treatment outweigh the potential risks.
Sheep Wool allergenic extract works by modifying the immune system's response to Ovis aries proteins. In a sensitized individual, the immune system incorrectly identifies these proteins as dangerous, producing IgE antibodies. The extract's molecular mechanism involves:
| Parameter | Value |
|---|---|
| Bioavailability | N/A (Subcutaneous/Epicutaneous) |
| Protein Binding | Minimal (interacts with IgE/IgG) |
| Half-life | Varies (Proteins degraded within hours/days) |
| Tmax | 15-30 minutes (Local); 1-2 hours (Systemic) |
| Metabolism | Proteolytic degradation |
| Excretion | Cellular catabolism |
Sheep Wool is classified as an Allergenic Extract. It is grouped with other animal dander extracts like Cat Hair, Dog Epithelium, and Horse Dander. Within the EPC (Established Pharmacologic Class), it is a Non-Standardized Animal Hair Allergenic Extract.
Common questions about Sheep Wool
Sheep Wool allergenic extract is primarily used for the diagnosis and treatment of allergies to sheep and wool-associated dander. In a diagnostic setting, it is used in skin prick tests to see if a patient develops a small, itchy bump, indicating an allergy. For treatment, it is used in 'allergy shots' (immunotherapy) to help the body build up a tolerance to sheep proteins over time. This is particularly helpful for people who work with sheep, such as farmers or textile workers, or those who have severe reactions to wool products. The goal is to reduce symptoms like sneezing, itchy eyes, and asthma flares.
The most frequent side effects are localized to the area where the injection or skin test was performed. Most patients experience redness, swelling, and itching at the injection site, which usually appears within minutes and fades within a few hours. Some people may also experience 'large local reactions' where the swelling spreads several inches across the arm. While these local reactions are uncomfortable, they are generally not dangerous. Occasionally, patients may feel tired or have a mild headache after their appointment.
While there is no direct chemical interaction between alcohol and Sheep Wool extract, healthcare providers generally recommend avoiding alcohol on the day of your injection. Alcohol can cause your blood vessels to dilate, which might speed up the absorption of the allergen into your bloodstream and potentially increase the risk of a systemic reaction. Furthermore, alcohol can mask the early symptoms of an allergic reaction, such as feeling lightheaded or flushed. To stay as safe as possible, it is best to wait until the following day to consume alcoholic beverages. Always check with your allergist for their specific office policy.
Sheep Wool immunotherapy is generally not started during pregnancy because of the risk of a severe allergic reaction (anaphylaxis), which could deprive the developing baby of oxygen. However, if you are already on a stable maintenance dose and become pregnant, your doctor may allow you to continue the injections at the same dose. This is because the risk of a reaction is much lower once you have reached the maintenance phase, and stopping the treatment could cause your allergy or asthma symptoms to worsen. You should notify your allergist immediately if you become pregnant or are planning to conceive. They will perform a careful risk-benefit analysis for your specific case.
Allergen immunotherapy is a long-term commitment and does not provide immediate relief like an antihistamine pill. Most patients begin to notice a decrease in their allergy symptoms during the 'build-up phase,' which typically takes 3 to 6 months. Significant improvement is usually seen after the first year of treatment at the maintenance dose. For the best and most long-lasting results, a full course of treatment usually lasts between 3 and 5 years. If you do not see any improvement after a year of maintenance therapy, your doctor may re-evaluate the treatment plan.
Yes, you can stop taking Sheep Wool injections at any time without experiencing physical withdrawal symptoms like those associated with some other medications. However, if you stop before completing the recommended 3-to-5-year course, your allergy symptoms are likely to return over time. If you need to pause your treatment for a few weeks due to illness or travel, you should not simply resume at your previous dose. Your doctor will need to adjust your dose downward to ensure your safety when you restart. Always discuss your plans with your healthcare provider before interrupting your schedule.
If you miss an appointment for your Sheep Wool injection, you should contact your allergist's office as soon as possible to reschedule. The procedure for a missed dose depends on how long it has been since your last injection. If it has only been an extra week or two, you may be able to continue with your scheduled dose. However, if several weeks have passed, your doctor will likely need to reduce the dose for your next injection to prevent an allergic reaction. Consistency is key to the success of immunotherapy, so try to stick to your schedule as closely as possible.
There is no scientific evidence to suggest that Sheep Wool allergenic extract causes weight gain. The extract consists of proteins and glycerin, which are administered in very small amounts that do not affect the body's metabolism or appetite. Unlike systemic corticosteroids (like prednisone), which are sometimes used to treat severe allergies and can cause weight gain, allergenic extracts work specifically on the immune system's tolerance. If you notice unexpected weight changes while on immunotherapy, you should discuss them with your primary care physician to look for other causes.
Sheep Wool extract can be taken alongside most common medications, such as birth control, thyroid hormones, and cholesterol-lowering drugs. However, it is vital to tell your doctor if you are taking beta-blockers, ACE inhibitors, or MAO inhibitors. These specific heart and blood pressure medications can make an allergic reaction much more dangerous and harder to treat with emergency epinephrine. You should also inform your allergist about any other allergy treatments you are using, such as other types of immunotherapy or high-dose antihistamines, to ensure your total 'allergic load' is managed safely.
The concept of 'generic' drugs is slightly different for biological products like Sheep Wool. While there isn't a single 'generic' version, there are several different manufacturers that produce Sheep Wool allergenic extracts, such as Greer Laboratories and HollisterStier. These products are generally considered interchangeable by allergists, but once you start treatment with a specific manufacturer's extract, your doctor will usually try to keep you on that same brand for the duration of your build-up phase. This ensures that the potency remains consistent, as non-standardized extracts can vary slightly between different companies.